You make a great argument, the problem is it's not supported in the least by the facts. It's just some twisted & distorted alternate reality you've created in some misguided attempt to win an argument. Rosenbaum didn't just throw a plastic bag at Rittenhouse. According witnesses Rosenbaum had threatened Rittenhouse and attempted to take his AR. Rittenhouse tried to run away from the guy and resorted to shooting him as a last resort. I notice that you conveniently omitted that Rittenhouse was attempting to leave the scene of a fire he was about to put out when he confronted by Zimmerman who was brandishing a pistol. Had Rosenbaum not charged Rittenhouse as he was disengaging from Zimmerman, none of this would have happened.
Clearly Rittenhouse was trying to avoid shyt, not start shyt as you claim.